federal reserve chairman ben bernanke told the senate banking committee today and his second day of testimony on capitol hill this week that interest rates will have to stay low for a lengthy period to counter a weak job market. the u.s. central bank chief prepared remarks were virtually identical to those delivered yesterday to the house financial services committee. and cheaper nike also told lawmakers that goldman sachs and other wall street firms may be looking into a sophisticated instrument investment instrument to make bets that greece will default on its debts. also about the healthcare summit which you can see live on c-span3 and c-span.org, a story from yahoo news saying that a consensus on how to rein in spiraling healthcare costs seem to be emerging as president obama some that the president agreed with assertions by oklahoma republican senator tom coburn that abuse them out account up to a third of the cost of a time of programs like medicare and medicaid. and is a major barrier to worldwide insurance coverage. senator coburn said that the cost is the chief reason millions of peo